ArcGIS Pro - Model Builder Help

[RickeyFight]

So below is what I was asked to calculate. I thought summarize within would cut it but it will not. 

This needs to happen for all 6000+ buildings in my city. 

Drew Flater‌

Thanks!

[RickeyFight]

Curtis Price‌  I will try your model!   Thanks

[RickeyFight]

Curtis Price‌ 

Can you post an export of your model?

[RickeyFight]

I was able to get my modified way to work. I am still looking at Curtis Price model. I think a model would be easier in the end. 

EDIT: I was not able to get my way to work.  I thought that I could go 

(Y+Y+Y)*a

but this is the formula I need. 

Y*b+ y*C